ok so just recently my wrx has been running rich. i dont understand why it would. on my 09 i have a spt catback, walbro 255 fuel pump, and avo top mount intercooler. after installing the intercooler i started backfiring. i have not done the tune yet but i will once i install my invidia cattless divorced downpipe. just wondering if it should be running that rich. i do run 93 octane. if you have any info about this please let me know.